Ours is grey-button, which means old. No optical sensor, but it does have pressure reverse.
Anyway, most you can hold the program button for 6 seconds and it will erase all codes.
Not ours. Not 10, not 30 seconds.
So I invariably programmed out opener to the neighbor's remotes because of this.
So, we come home to find our garage door open from time to time.
Well, I found out that supposedly, these only hold 5 codes. So, I changed the remote code repeatedly until the original code didn't work, and then reprogrammed our 2 remotes.
WOOT!
Let's see if that prevents the midnight garage door opening.
Garage Doors
All in all, a new opener isn't horribly expensive, and would come with optical sensors, and install, and everything new. I REALLY ought to do that. I'd get 2 new remotes with digital code hopping and all sorts of goodness.
It's just been lots of expenses lately. :/